CVE-2026-23931Network attack vector

Plaintext macro disclosure via validatate.api.exists

Published Aug 18, 2026 · Updated Aug 18, 2026

Information disclosure in Zabbix 7.4.0 through 7.4.10 allows remote authenticated users to read plaintext user macro values via validatate.api.exists. Vendor records do not publish the exact parameter path, but the 7.4.11 Frontend fix for inline validation changed existence checks to use strict comparison, which indicates the action exposed an observable value-matching oracle during existing-value validation. Only authenticated HTTP access to the Frontend is required, and Zabbix states that macros stored as Secret text or Vault secret are not affected.

CVSS severity5.3
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Zabbix 7.4.0 through 7.4.10 allows remote authenticated users to read plaintext user macro values via validatate.api.exists. Vendor records do not publish the exact parameter path, but the 7.4.11 Frontend fix for inline validation changed existence checks to use strict comparison, which indicates the action exposed an observable value-matching oracle during existing-value validation. Only authenticated HTTP access to the Frontend is required, and Zabbix states that macros stored as Secret text or Vault secret are not affected.

The record

CVE
CVE-2026-23931
Published
Aug 18, 2026
Updated
Aug 18, 2026
Vendor
Zabbix
Product
Zabbix
Classifications
CWE-203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.4.0 <=7.4.10 changes=[{"at":"7.4.11","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zabbix · Zabbixversion=7.4.0 <=7.4.10 changes=[{"at":"7.4.11","status":"unaffected"}]

Published CVSS scores

5.3ZabbixCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-203Observable Discrepancy

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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